3y inflation

Price of the roll rise in the first year by 9%, the second year fell by 5% and in the third year increased by 3%.

Calculate the average annual increase in price of the roll.

Correct result:

p =  2.2 %

Solution:

$p=100(\sqrt[3]{(1+{\displaystyle \frac{9}{100}})\cdot (1-{\displaystyle \frac{5}{100}})\cdot (1+{\displaystyle \frac{3}{100}})}-1)=2.2\mathrm{\%}$

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